ABB S203M-B63NA miniature circuit breaker, a 63 A 3P+N B curve MCB from the System pro M Compact S200M series for industrial and commercial circuit protection.
£176.12
The ABB S203M-B63NA is a high quality miniature circuit breaker (MCB) from the trusted ABB System pro M Compact S200M series, designed to provide reliable overload and short circuit protection in industrial, commercial and electrical distribution applications. Featuring a B characteristic trip curve, it is suitable for circuits with low inrush currents and standard resistive loads.
This miniature circuit breaker uses two tripping mechanisms: a delayed thermal mechanism for overload protection and an electromechanical mechanism for short circuit protection. The S200M range is engineered for compact installation, dependable performance and compatibility with ABB modular DIN rail accessories.
With a rated current of 63 A, a 3P+N configuration and a 10 kA breaking capacity, the S203M-B63NA is ideal for protecting three-phase distribution circuits where neutral switching is required.
Miniature circuit breakers such as the ABB S203M-B63NA help protect electrical circuits by disconnecting the supply when overloads or short circuits occur. The thermal trip responds to sustained overload conditions, while the electromechanical trip reacts quickly to short circuit faults.
The B curve characteristic is intended for circuits with low inrush currents, making this device suitable for standard lighting, heating and general distribution applications where fast fault response is required.
| Current | 63 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M Compact S200M |
| Model | S203M-B63NA |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 63 A |
| Number of protected poles | 3 |
| Neutral pole | Switched neutral |
| Pole configuration | 3P+N |
| Trip characteristic | B |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Width | 4 modular spacings |
| Built-in depth | approx. 69 mm |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It is used to provide overload and short circuit protection for three-phase electrical circuits where neutral switching is required.
The B curve is designed for circuits with low inrush currents, such as standard lighting, heating and general distribution loads.
The ABB S203M-B63NA has a rated current of 63 A.
3P+N means the device has three protected phase poles together with a switched neutral pole.
It is designed for DIN rail mounting inside electrical distribution boards, control panels and industrial enclosures.
ABB System pro M Compact miniature circuit breakers are widely used by electrical contractors, panel builders and machine manufacturers for reliable protection across industrial, commercial and distribution applications.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...